You may also see if installing Zobel components (Rz=2.7R, Cz=0.1uF) changes anything.

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Thanks Peter, I'll try that 300pF capacitor. Just one question, by positive and negative chip input you mean in the rca's ou directly in the board? And the Zobel components won't have an impact in the sound?

The 300pF cap mounts directly to chip pins 7 and 8, there is no separate footprint for it on the board.

More than likely, Zobel won't help here, but it won't hurt to try. And yes, it will affect the sound: you may like it or not

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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

That grounding method was specifically for stereo amp. Monoblocks are much more forgiving to grounding errors and if you wire them in conventional method (4 wires from rect board to amp board) it should work fine too. You may experience problem though, if Earth ground is connected to chassis, in that case connect output ground to chassis instead (from negative speaker post) and Earth ground not connected (to chassis).

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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Facing the competition from various group buy offers, I decided to introduce new version of LM4780 board. Since my cost is also lower now, I'm passing the savings to potential buyers. The board as you see in a picture is $20.

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

In other words you are getting two separate LM4780 PCBs at $10ea, as pictured below. Untill I do changes to my website, those prices will also include worldwide shipping. If you order larger quantities, further discount will apply. Just contact me directly through PM.

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC